Unity World Creation. error CS0246: The type or namespace name 'SteamVR_TrackedObject' could not be found. Are you missing an assembly reference?

[Val_ntineVT]

UNITY VER: 5.6.3p1
VRCSDK-2018.01.26.13.13_Public

Have been working on a world creation and haven't had any problems until recently. I had some 'Amazon' script errors as well but those were fixed once I updated to the most recent SDK. Although this error is still occuring. I believe this is why my VRCSDK drop down option is still only shows "Clear Cache and PlayerPrefs. So I am currently unable to update my world.

I have been looking up if anyone else has similar errors, but nothing has fixed my errors. I have no experience in coding so I don't want to mess with that unless I know exact step by steps.